Thanks to all for the feedback - I'm sure someone will see that it is entirely possible to get this wrong as a first time user.
About the only thing driving me nuts now that I understand, is this "undefined" thing... Shame you can't turn that off - it happens after many lines entered manually - though everything appears to work.
I noted that despite using a 4MB ESP12, there's only, what, 12K to store programs? That's what I read in the docs - is there a way around that now ? Seems to me there is around 3MB spare (now I have that getFreeFlash() working - thanks Ollie.
This looks like it might be fun.
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